RU161267U1 - HEAT GENERATOR - Google Patents

Abstract

A liquid or gaseous fuel heat generator including a burner, a combustion chamber, heat exchangers and a fan. The proposed heat generator is a combination of two heat exchangers and a fuel combustion zone, which functions as a high-temperature heat exchanger. All this, combined with the thermal insulation of the sheets covering the heat generator, allows air to be heated to temperatures from 60 to 400-500 ° C, depending on the air flow at high values of efficiency in all operating modes. The heat generator can be used in various areas of the national economy, for example, in drying units, bakeries, for heating rooms, etc.

Description

The claimed technical solution relates to the field of energy and can be used in various areas of the national economy, for example, in drying units, bakeries, for heating premises, etc.

The claimed utility model relates to heat generators operating on liquid or gaseous fuel, and including a burner, a combustion chamber, heat exchangers, a fan, and used for heating air.

The claimed utility model of a heat generator includes a combustion chamber zone and two heat exchangers installed in series (Fig. 1).

Heat exchangers are generally accepted. They consist of two chambers interconnected by a series of tubes. The use of two heat exchangers instead of one allows for a more complete heat transfer from hot gases and to ensure the temperature of the gases in the exhaust pipe is not more than 100 ° C.

The use of two heat exchangers instead of one allows to reduce the temperature differences at the inlet and outlet of each of them and, therefore, to reduce their heat stress. Heat exchangers with a lower temperature level can be made from cheaper heat-resistant materials.

The heat exchangers and the area of the combustion chamber are closed by sheets forming a closed volume. The sheets are coated on the outside with high temperature thermal insulation material. At the end of the last heat exchanger, a fan 10 is installed, forcing cold air into the heat generator. The injected air washes the surfaces of the heat exchangers 7 and the sheets covering the heat generator. Passing through heat exchangers, the air heats up and enters the zone of the combustion chamber. The combustion chamber is a pipe 4, which includes the nozzle of the burner 3. The pipe of the combustion chamber leads the hot gases to the chamber of the first heat exchanger. In the proposed heat generator, the length of the pipe 4, which is the combustion chamber, is recommended to be 1.5 times the length of the flame. Torch lengths of burners of different capacities are given in the reference literature.

The pipe of the combustion chamber is closed by a casing 1, which is a pipe of a larger diameter. An inlet 2 is made in the lower part of this casing from the installation side of the burner nozzle, and an outlet is made at the top at the opposite end of the casing. From the outlet through the pipe 6, the heated air is directed to the consumer.

In the annular gap between the pipe of the combustion chamber and the pipe of the casing to increase the hot surfaces, a sleeve 5 with ribs running along these pipes is installed. Thus, in the heat generator, the heat released during fuel combustion is transferred to the surfaces of the parts of the combustion zone, the surfaces of the heat exchangers and the surfaces of the sheets covering the combustion zone and heat exchangers. Thermal insulation of the cover sheets reduces the heat loss by radiation from the surfaces of the structural parts.

The efficiency of heat removal from heat exchangers is due to the fact that the air pumped by the fan sequentially washes surfaces starting from a heat exchanger with a low temperature and ending with a heat exchanger with a high surface temperature. After heat exchangers, air enters the combustion chamber area. It is additionally heated by contacting the surfaces of the casing and sheets covering the combustion zone. The last step in supplying heat to the air is to pass it through the annular gap between the pipes of the combustion chamber and the casing of the chamber having the highest temperatures.

The temperature of the air leaving the heat generator is controlled by a change in its flow rate. The air flow rate is controlled by changing the fan speed and changing the position of the throttle valve in the outlet pipe of the heated air. The industry produces electric motors for driving fans with various methods of changing the frequency of rotation, including using frequency converters.

In order to ensure a steady and stable movement of hot gases from the combustion chamber through heat exchangers during start-up, heating and operation in steady-state conditions, a certain amount of vacuum must be maintained in the exhaust pipe. This vacuum is supported by the control device 9 due to the supply to the exhaust pipe of the part of the air pumped by the fan. The regulation of the bore ensures that the required vacuum is maintained in the exhaust pipe. Air is supplied to the exhaust pipe in the direction of gas movement, creating a vacuum.

The heat generator provides air heating to temperatures from 60 to 400-500 ° C, depending on the air flow rate with a high value of efficiency in all operating modes.

The claimed technical solution relates to the field of energy and can be used in various areas of the national economy, for example, in drying units, bakeries, for heating rooms and etc.

The claimed utility model relates to heat generators operating on liquid or gaseous fuel, and including a burner, a combustion chamber, heat exchangers, a fan, and used for heating air.

The proposed technical solution allows you to adjust the temperature of the heated air from 60 to 400-500 ° C, providing a high efficiency in all operating modes.

The list of items in the drawing FIG. 1 to the application.

1 - pipe casing of the combustion chamber,

2 - hole in the casing for air inlet,

3 - burner

4 - pipe combustion chamber,

5 - sleeve with ribs,

6 - pipe for the exit of heated air with a throttle,

7 - heat exchangers,

8 - exhaust pipe

9 - a device for controlling the vacuum in the exhaust pipe,

10 - fan

11 - inlet of cold air.

Claims (1)

A heat generator including a burner, a combustion chamber and a fan, characterized in that it comprises a combustion chamber zone, two heat exchangers installed in series, a rarefaction control device and an exhaust pipe, the combustion chamber zone comprising a combustion chamber made in the form of a pipe closed by a casing, and a casing made in the form of a pipe of larger diameter with the formation of an annular gap in which a sleeve with ribs located along the pipes is installed, while on one side of the casing an air inlet is made a, and on the opposite side there is a nozzle with a throttle for the removal of hot air to the consumer, while the area of the combustion chamber and two heat exchangers are covered with sheets, the outer surface of which is covered with high-temperature heat-insulating material, and the fan is located behind the second heat exchanger and is configured to pump cold air for heating and washing the surface of heat exchangers and cover sheets, the vacuum control device in the exhaust pipe is made with the possibility of echeniya stable movement of the hot gases flow through the heat exchangers during starting, warming up and in the steady-state conditions by feeding air discharge fan in the exhaust pipe in the direction of gas motion.

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